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jQuery Upload File without Reloading Page in using Handler (Ashx) in C#, VB.NET

Feb 1, 2015

Here I will explain how to upload files using jQuery without reloading page in using handler (ashx) in c#, or jQuery upload file without reloading page in using Handler in c#, or asynchronous file upload using jQuery in with c#,

In previous articles I explained jQuery call page methods from json, 7 + jQuery multiple fileupload plugin examples, jQuery check file size before upload in,
jQuery setInterval() function example, jQuery upload multiple files using uplodify plugin in and many articles relating to jQuery, JavaScript and Now I will explain how to upload files using jQuery with generic handler (ashx) in using c#,

To upload files using jQuery with generic handler (ashx) in first create the new web application and open Default.aspx page and write the following code

<html xmlns="">
<head runat="server">
<title>uploading file using jquery with generic handler ashx</title>
<script src="" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('#btnUpload').click(function () {
var fileUpload = $("#FileUpload1").get(0);
var files = fileUpload.files;
var test = new FormData();
for (var i = 0; i < files.length; i++) {
test.append(files[i].name, files[i]);
url: "UploadHandler.ashx",
type: "POST",
contentType: false,
processData: false,
data: test,
// dataType: "json",
success: function (result) {
error: function (err) {
<form id="form1" runat="server">
<input type="file" id="FileUpload1" />
<input type="button" id="btnUpload" value="Upload Files"/>
If you observe jQuery ajax method in above code we mentioned “UploadHandler.ashx” by using this file we will upload files in server side. Now add handler file in your application by following below steps

Right click on your application à select Add New Item à select Generic Handler file à Give a name and click Add button like as shown below

Once you finished adding handler file now add new folder in your application “uploads” that would be like as shown below

Now open UploadHandler.ashx file and write the following code

C# Code

<%@ WebHandler Language="C#" Class="UploadHandler" %>

using System;
using System.Web;
using System.IO;

public class UploadHandler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
if (context.Request.Files.Count > 0)
HttpFileCollection files = context.Request.Files;
for (int i = 0; i < files.Count; i++)
HttpPostedFile file = files[i];
string fname;
if (HttpContext.Current.Request.Browser.Browser.ToUpper() == "IE" || HttpContext.Current.Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")
string[] testfiles = file.FileName.Split(new char[] { '\\' });
fname = testfiles[testfiles.Length - 1];
fname = file.FileName;
fname=Path.Combine(context.Server.MapPath("~/uploads/"), fname);
context.Response.ContentType = "text/plain";
context.Response.Write("File Uploaded Successfully!");
public bool IsReusable {
get {
return false;

<%@ WebHandler Language="VB" Class="Handler" %>

Imports System.Web
Imports System.IO

Public Class Handler : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
If context.Request.Files.Count > 0 Then
Dim files As HttpFileCollection = context.Request.Files
For i As Integer = 0 To files.Count - 1
Dim file As HttpPostedFile = files(i)
Dim fname As String
If HttpContext.Current.Request.Browser.Browser.ToUpper() = "IE" OrElse HttpContext.Current.Request.Browser.Browser.ToUpper() = "INTERNETEXPLORER" Then
Dim testfiles As String() = file.FileName.Split(New Char() {"\"c})
fname = testfiles(testfiles.Length - 1)
fname = file.FileName
End If
fname = Path.Combine(context.Server.MapPath("~/uploads/"), fname)
End If
context.Response.ContentType = "text/plain"
context.Response.Write("File Uploaded Successfully!")
End Sub 
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Return False
End Get
End Property
End Class

Now run your application that will allow you to upload files in upload folder using handler files.


Download Sample Attached

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Anonymous said...

Thanks a lot for you Blog, I have a Question when I run the program in VS 2012 the system show me a message JavaScript FormData not def. could you help , thanks again

Prince said...

Hi same problem FormData not def. please help

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